Allosaurus

The name Allosaurus means "different lizard". It is derived from the Greek ("different, other") and ("lizard"). This theropod's teeth were razor sharp, serrated and curved toward the inside of its mouth on the upper jaw. On the lower jaw, the teeth had a more upright position. This allowed the hunter to hack, axe-like, into flesh with its upper teeth, while its lower teeth could then rip flesh from bone before the dinosaur immediately gulped it down.

Ankylosaurus

Ankylosaurus, which means "fused lizard" is a genus of ankylosaurid dinosaur. Ankylosaurus is often considered the archetypal armored dinosaur. Other ankylosaurids shared its well-known features-the heavily-armored body and massive bony tail club-but Ankylosaurus was the largest known member of the family. Armor wasn't Ankylosaurus' only defense. It also had a club at the end of its tail. This club was formed by a set of tightly packed vertebrae covered in armor and could have been a powerful weapon. Ankylosaurus' tail wasn't particularly flexible, though, so maneuvering it to strike a predator might have been difficult.

Apatosaurus

The Apatosaurus, was one of the largest land animals that ever existed, with an average length of 75 ft and a mass of at least 23 metric tons. The composite term Apatosaurus comes from the Greek names apate/apatelos meaning "deception"/"deceptive" and sauros meaning "lizard"; thus, "deceptive lizard".

Brachiosaurus

Brachiosaurus was one of the largest dinosaurs of all time, Brachiosaurus could have towered over most four-story modern office buildings today. At first scientists thought the dinosaur weighed 80 tons, but now they’ve lowered the estimate to around 50 tons, which is equivalent to six or so elephants jammed together on a scale. Brachiosaurus remains one of the biggest, tallest, heaviest and longest known sauropods, although its tail was relatively short when compared with others in this group of diverse plant eaters.

Brachylophosaurus

Brachylophosaurus may be its official name, but many affectionately know this relatively "new" dinosaur as "Elvis," due to its unusual head crest that resembles the famous rock 'n roll singer’s hair. Fossil collector and paleontologist Charles Sternberg first the dinosaur described it in 1953. This animal is notable for its bony crest, which forms a flat, paddle-like plate over the top of the skull.

Carcharodontosaurus

The dinosaur known by the common name "shark-toothed lizard" is obviously not a shark, nor a lizard. In fact, if the Carcharodontosaurus were to have a closest living relative it would be a member of the order Crocodylia. The inside of its skull and inner ear, as well as its brain size, are similar to some modern reptiles.

Deinonychus

Although Deinonychus was only about as big as a two-passenger compact car, every inch of this dinosaur contributed to its reputation as being one of the world's deadliest dinosaurs. When its powerful jaws opened, over 60 daggerlike teeth flashed, ready to dig into much larger dinosaurs such as Sauropelta and Tenontosaurus. Claws on its grasping hands could inflict severe damage that would have been compounded if Deinonychus decided to karate-kick unfortunate victims with one, or both, of its toe.

Diplodocus

Diplodocus was a genus of several four-legged, plant-eating dinosaurs with very long necks, whiplike tails and a specialized claw on one toe of each foot. Its tail and claw being its most defensive weapons.Diplodocus weighed less than half as much as similarly shaped dinosaurs like Apatosaurus.

Spinosaurus

Spinosaurus holds the world record for being the largest known carnivorous dinosaur, given its impressive length and 9.9-ton build. The skull of Spinosaurus was long and narrow like that of a modern crocodilian. Spinosaurus is thought to have eaten fish; evidence suggests that it lived both on land and in water like a modern crocodilian.

Stegosaurus

Stegosaurus possessed hard-to-miss defining characteristics: leaf-shaped plates that jutted out of its back and pointy spines for defense. Meat eaters would not have had trouble spotting the lumbering veggie-loving "fashion plates," but two-ton Stegosaurus could have put up a good fight.

Triceratops

When an odd pair of horns was excavated at the high plains east of the Rocky Mountains in the 1880s, paleontologists thought they had found the remains of a prehistoric bison. What they really discovered were two of the three horns of Triceratops, a dinosaur that holds three records among all horned dinosaurs. It was the largest, heaviest and, in its time, most common ceratopsid. These were four-legged, plant-eating dinosaurs characterized by broad, bony frills and well-developed brow horns.

Tyrannosaurus

Paleontologists were shocked when they unearthed a near-complete skeleton of Tyrannosaurus in 1902. By its bones alone, the scientists knew they had found one of the biggest flesh-eating predators of all time. Its head was the size of an adult person. The Tyrannosaurus body could extend the entire width of a tennis court. Up to seven tons of muscle and other tissues filled out the rest of its sturdy frame. This was a monster carnivore that must have terrified all other dinosaurs during the Late retaceous.

Velociraptor

Velociraptor (commonly shortened to 'raptor') is one of the dinosaur genera most familiar to the general public due to its prominent role in the Jurassic Park motion picture series. In the films it was shown with anatomical inaccuracies, including being much larger than it was in reality and without feathers. It is also well known to paleontologists, with over a dozen described fossil skeletons—the most of any dromaeosaurid. One particularly famous specimen preserves a Velociraptor locked in combat with a Protoceratops.